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CAS OpenIR  > 中科院上海应用物理研究所2011-2017年  > 期刊论文
题名:
Electrochemical detection of PCR amplicons of Escherichia coli genome based on DNA nanostructural probes and polyHRP enzyme
作者: Wen, YL; Wang, LL; Xu, L; Li, LY; Ren, SZ; Cao, CM; Jia, NQ; Aldalbahi, A; Song, SP; Shi, JY; Xia, JY; Liu, G; Zuo, XL
刊名: ANALYST
出版日期: 2016
卷号: 141, 期号:18, 页码:5304-5310
DOI: 10.1039/c6an01435f
通讯作者: Liu, G (reprint author), Shanghai Inst Measurement & Testing Technol, Div Chem & Ionizing Radiat Measurement Technol, Shanghai 201203, Peoples R China. ; Zuo, XL (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Div Phys Biol, Shanghai 201800, Peoples R China. ; Aldalbahi, A (reprint author), King Saud Univ, Dept Chem, Riyadh 11451, Saudi Arabia.
文章类型: 期刊论文
英文摘要: Fast, portable and sensitive analysis of E. coli is becoming an important challenge in many critical fields (e.g., food safety, environmental monitoring and clinical diagnosis). Thus, electrochemical biosensing of PCR amplicons from the bacterial genome has attracted reasonable research attention. In this work, we utilized a 3D DNA tetrahedral probe to establish a "sandwich-type" electrochemical DNA biosensor for sensitive and specific analysis of a 250 bp unpurified PCR amplicon from the uidA gene of the E. coli genome. Asymmetric PCR was used to produce single-stranded PCR products. Streptavidin-polyHRP80 was employed to improve the signal gain during electrochemical detection. We optimized important experimental conditions for DNA sensing, including the streptavidin-polyHRP, the signal probe and the ion strength. Finally, we achieved a remarkable sensitivity of 10 fM synthetic DNA target, and successfully performed the analysis of PCR amplicons from as low as 0.2 pg mu L-1 of E. coli genome. Compared with traditional single stranded DNA (ssDNA) probe based detection, our present work demonstrated 3 orders of magnitude improvement in sensitivity. In addition, our electrochemical DNA biosensor was 4 orders of magnitude more sensitive than normal electrophoretic analysis of PCR products. Our work made important progress in DNA nanostructured probe-based biosensors toward application in real applications.
收录类别: SCI
语种: 英语
WOS记录号: WOS:000382698300012
ISSN号: 0003-2654
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.sinap.ac.cn/handle/331007/26493
Appears in Collections:中科院上海应用物理研究所2011-2017年_期刊论文

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Recommended Citation:
Wen, YL,Wang, LL,Xu, L,et al. Electrochemical detection of PCR amplicons of Escherichia coli genome based on DNA nanostructural probes and polyHRP enzyme[J]. ANALYST,2016-01-01,141(18):5304-5310.
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文件名: Electrochemical detection of PCR amplicons of Escherichia coli genome based on DNA nanostructural probes and polyHRP enzyme.pdf
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